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An Algebraic Challenge -- Part 2

[Interestingly, there is no Part 1 to this given series of questions.]

Before looking at the question, please read the instruction carefully.

INSTRUCTION: The below given question is not a very tough one, it is just for self analysis of how much time you take to solve it. If you can solve the question WITHIN 8 SECONDS after reading the QUESTION, then, you are exceptional (according to me).

QUESTION: If x +(1/y) = 1 and y - (1/z) = 1, then the value of 9xyz is

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